Rotary kiln and cooler



Dec. 20, 1927.

P. T. LINDHARD ROTARY KILN AND COOLER Filed Nov. 19,l 1925 5 Sheets-Sheet l i 22m/ m w n /N VE 1V TUR Dc. 20, 1927. v 1,653,050

P. T. LINDHARD ROTARY KILN AND COOLER Filed Nov. 19, 1925 5 lSheelzs-Sheer: 2

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Dec. 20, 1927. 1,653,050

P. T. LINDHARD ROTARY KILN AND COOLER Filed Nov. 19, n1925 5 sheetsasheet 4 [NVE/WOR Br y MMM/Ml@ Dec. 20, 1927. 1,653,050

P. T. LINDHARD ROTARY KILN AND COOLER Filed Nov. 19, 1925l 5 sheets-sheet 5 /W-WTM Patented' Dec.A 2o, 1927.

UNITED STATES A y 1,653,050 a1 A'1l:1\1'rOFFICE.A l

POVL T. LINDHARD, OF BROOKLYN, NEW YORK, KSSIGNOR T0 F. L. SMIDTH & UO., OF

i `NEW YORK, N. Y., A CORPORATION OF NEW JERSEY. i

ROTARY KILN .AND COOLER.

Application led November This invention relates to rotary kilns and coolers of the general type showny in Letters Patent of the United States, No. 1,404,381 and No. 1,510,140, in which the devices in 5 which the clinker is cooled are directly associated with and lin effect form part of the kiln, moving with the kiln in its rotation. The general purpose of the present invention is to improve the construction shown particularly in said Letters Patent No. 1,510,140, in which the cooling of the clinker is effected in a series of drums supported by the kiln or an extensiony thereof and about its periphery and to meet satisfactorily the require- .ments which have been developed in the practical use of such kilns andcoolers. In coolers of this type, the length of the cool-v in drums is limited ordinarily by the available space and by the amount of weight 2'0 which the kiln shell can carry, while the cross section of the drums is largely dependent upon thediameter of the kiln itself. In the former construction, the clinker is sometimes discharged too quickly, that is, before it has been cooled sufficiently, particularly in the case of the larger lumps or pieces which require more time for cooling than do the smaller pieces. It has therefore been vthe principal object of this invention to make it possible to give to the cooling devices avery large radiating surface and to provide for circulation of' the cooling air, not only through the cooling drums but also around the drums, so vthat the heat radiated from the drums shall be carried off as rapidly as possible, while-atv the Sametime no materially greater volume of air is used in the vcooling than is necessary to sustain combustion in the kiln. Provision is also made whereby the clinker can be cooled to some extent within the kiln or an extension thereof and before it comes in contact with the metal parts of the cooling drums, which cannot be protected easily or advantageously by a lining of lirebrick or other refractory heatresisting material. A further object of the invention is also to improve certain ofthe details of construction so that the structure can be dismantled readily and repaired in case of need and shall also permit ready aci` cess to the interior of the kiln and to provide for easy removal of the fuel pipe, to the end that loss of time through shut-downs and-repairs shall be reduced to a minimum. V The invention will be more fully explained showlng a portion of the kiln and its` extenl broken lplane of section indicated a 19, 1925. Serial N0. 70,110.

hereinafter with reference to theaccompanying drawings in which it is illustrated and in whichv Fi re 1 is a view in longitudinal section sion, with lts associated parts and the cooling devices, .the cooling drums above the kiln' extension being shown in side elevation. Figure 2 is a view of the same as seen from the left-hand in Figure 1, the righthand half ofv vFigure 2 being shown Ain en elevation, while segments of the lefI half are shown in sectional elevati Figure 3 is a -view in outline and on a smaller scale than that of'Figures 1 and 2, showing particularly the arrangementgof the fuel feeding devices.

Figures 4 and 5 are detail views on a larger scale insectional elevation and face view respectively, illustrating particularly the connections between the kiln orits extension and the cooler drums.` Figure 5 more particularly shows the flangedplates, forming the ring to which the elbow connections to the individual drums are secured.

I Figures 6 and 7 are views in longitudinal section and in end elevation and transverse section, illustrating a slightly modified arrangement of the cooling drums.

Figure 8 is a detail view of the two-part kiln closing door.

The kiln may be supported in the usuall manner through its shell 1 by tires 2 which rest on rollers 2a which are mounted on suit'- able foundations 3. In the embodiment of the invention shown the shell 1 has secured to it, as by means of flanged rings 5, an extension 4, which is preferably of slightly smaller diameter. The main shell 1 and the extension 4 receive the usual lining 6 of refractory material, which is increased slightly in thickness at theend of the burning zone of the kiln, as indicated at"7,. for thepurpose of retarding slightly the movement o f the clinkerfrom the burning zone into the cooling zone and causing an accumulation of clinker in the burning zone. The inside diameter of the kiln or its extension is further reduced at or near 'the extremity of the kiln extension by yfurther thickening of the refractory lining, as indicated at 32.

In the end portion of the kiln or its ex tension, in advance of the shoulder 32, are formed openings 8 for the discharge of the 110 l smaller lumps or pieces oflclinke'r from the cooling zone of the kiln-into the cooling 'de-f vices presently to be described.V These openings 8 are provided' with rotective bushings 9, provision being ma e whereby such ,bushings may be removed and replaced from the outsidev of the kiln or its extension `when the connecting elbows have been removed. As shown, each bushing may 10 be provided with a cross rib 11 for the purpose of reducing, if so desired, the size of the openings through. which the clinker may pass from the kiln or its extension into the cooling drum.` These bushings are prefer- 15.ably4 extended inwardly beyond the shell` 4, the spaces between the inwardly extended ends of the circumferential series of bushings being lilled with ire'brick or other suitable refractory material. as indicated at 12, so as to form a continuation of the lining 6. A sectional ring 13, surrounding the kiln extension externally and securely fastened to the shell 4, is formed with suitable openings y13, preferably shouldered, as at 13", to receive the bushings 9, preferably shouldered, as at 14,`and is suitably secured to the shell 4.

Each section ring 13 has secured lthereto, as` by bolts 9, an elbow 10, to the other end of which is secured, as by bolts 10a, a 90 vdegree elbow 15, the two elbows 10 and 15, forming a connection through which the clinker' is discharged from the kilnv or its extension into the first cooling drum 16. Each of the cooling drums 16 may have any suitable or convenient shape in cross section.'-

'As shown, each drum is semi-circular with `a atfcover. The feed end, that is, the end lat which the clinker is admitted from the.

40 kiln or its extension, of each drum 16, is

secured to a late 17, which `in turn is securedto the s ell 4 of the kiln extension by any suitable and substantial means, whereas the delivery end of each drum 16 is supported upon the corresponding final cooling drum 18 b means of an expansion joint 19 which at t e same time provides the necessary opening for the discharge of the clinker vfrom the drum 16 into the corresponding drum 18, a spout 2O being Yarranged-1n the drum 18 for the purpose of preventing the return of the clinker from\ the drum 18 to the drum 1 6 when, in the e rotation of the kiln, to which they are secured, the drums@ 16 and 18 reach or approach the high poqint. The drums 18 may also have any suitable shape'in cross section, but preferably the same shape as the drum 16.

Thel axes of the'drums 16 and 18 are preferably parallelwith theaxis of the kiln, so that the drums have the, same pitch as the kiln. As the material in the drum 16 moves `1n a direction toward the feed end of the 05 kiln and therefore ,on an'ascending grade,

iights 21 of usual character to causethe clinker to move in the proper direction as the drums revolve about the axis of the I kiln. In the drums 18 no flights are, needed as the clinker in thesedrums/ moves toward the discharge end under the .influence of gravity during the rotation of the kiln. Each drum 18 is provided with a discharge opening, as at 22, from which the clinker may drop into a hopper `23 and thence upon a conveyor 24.

Near their delivery ends the drums 18 arc supported by the plate 17, to which they are secured in any convenient manner. At the other end each drum 18 is supported by a flexible or yielding plate 26, which` is in turn secured to the shell of the kiln, as by means of the flangedv ring 5. The iexible or yieldingV character of the plate k26 permits of the free expansion and contraction of both drums 16 and 18 under the iniuence of changes in temperature. Both the plate 17 and flexible plate 26 are preferably formed in sections, one for each pair. of drums 16 and-18, and the sections may be inter-connected at their outer edges, asindicated at 27 and 28 in Figure 2. This fea-I ture of construction permits the ready removal of one drum or another for inspection or repair.

In order to provide for constant circulation of relatively cool air about the exteriors of the drums 16 and 18, thereis provided about the upper part of the kiln extension and its associated drums. a stationary .hood

29, open at bottom and at the top, con-r nected with a stack 30, which is carried upwardly through the roof of the building so as to create an upward draft. which assists materially in keeping down the temperature o f the cooling drums and therefore promotes the cooling of the clinker as it passes t-hrough. the drums.

The o en discharge end of the kiln extension 1s contracted somewhat by an inwardly extended flange 31 and the shoulder 32 formed by the lining so that the larger pieces of clinker which are not discharged through the openings 8 in thc kiln extension will be retained within the kiln eXtension until such time as it may be convenient to remove them. The anged ring 31 'is preferably formed with a cylindrical liange 33/ to carry the sealing ring 34, which fits into the groove of a ring 35 carried by the two-part door 36 which closes the end of the kiln, the sealing ring preventing the entwo parts of the door close about the fuel pipe 39 and ma. be provided with a door 40 to permit t e removal ofthe larger pieces of clinker from time to time, without openin the kiln widely, and are provided `also wlth suitable peep holes 41 to permit observation of the interior of the kiln. The sealing ring 34, above mentioned, is loosely mounted on the cylindrical flange 33 so that longitudinal expansion and contraction of the kiln may take place, although the door does not move in the direction of the longitudinal axis of the kiln.

The fuel pipe 39 is preferably insulated at its inner end so as to prevent the destruction of the pipe and also to prevent the combustion of the fuel within the pipe before it is discharged into the burning zone of the kiln. It is also so supported as to permit it to be moved longitudinally to change the pointI of discharge of the fuel with respect to the burning zone of the kiln. As shown. the fuel pipe is supported by a trolley 42 and strap 43 from an I-beam 47, one end of which may be supported by the frame 38 and the other by a frame 48 on the burners platform 48a. The fuel pipe may also carry, by means of a strap 45, a roller 44 to bear against the under side of the beam 47. A chain 46 may be provided to effect the movement of the fuel pipe.

The fuel, which is commonl powdered coal, may be delivered to the uel pipe 39 throughl a smaller pipe 49 which forms a telescope joint with the pipe 39 so that the pipe -39 can be moved back and forth readily without disturbing the pipe 49. If powdered coal is used as a fuel, the air to be delivered with the coal may be drawn conveniently, in a preheated condition, fromthe top ofthe hood 29 through a pipe connection 50 connected to the suction side of a fan blower 51, by which air is discharged into the pipe 49 by an injector 52, to which the coal is delivered by a feeder 53, as usual, and as illustrated particularly in Figure 3.

In the slightly modified embodiment of the invention shown in Figures 6 and 7, the first cooler drum 54 is conlcal in shape and is provided internally with a longitudinal divls'on plate 55, which has ights 56 on both sides so as to facilitate the movement of the clinker through the drum. At its delivery end the drum 54 is connected by lsuitable connections 57 -to two secondary drums-58, each of which receives half, more or less, of the clinker, which passes through the drum 54 on opposite sides of the long:

tudinal partition plate. A somewhat greater cooling surface may thus be provided without increasing the diameter of the drums.

The clinker is discharged into the drums 54 posed radiall with respect to the kiln extension and t erefore do not have the same advantages as do the elbows 10 and 15 in respect to the removal and replacement of the drums and their connections.

In the operation of the improved kiln and cooler, the clinker which is formed in the burning zone of the kiln, is discharged over the internal ring 7 of the'lining into the extension or cooling 'section of the kiln, Where it is cooled somewhat before it is discharged through thev openings 8 into the drum 16 and thence into the drums 18, in both of which it is cooled by the current of air drawn through these cooling drums in a direction opposite to that of the movement ofthe clinker by the draft within the kiln. At the same time the drums are cooled exteriorly by the relatively cool ai-r made to circulate about the drums, as before described, soI that the clinker is well cooled before its discharge from the cooling` drums.- The preheated air from the hood 29 is delivered through the pipe 50 to the suction side of the fan 51, by which it is delivered with the fuel to the burner. The air which traverses'thel served that the construction is such as to rprovide for the ready dismantling of separate cooling drums for the purpose of repalr and renewal as may be necessary, that convenient and ready access toA the kiln is afforded, that the fuel pipe can beeasily lad" justed in position or withdrawn for repair or renewal and that all of these operations can be performed witha maximum of convenience and a minimum of loss of time.

It will be understood that various changes in details of construction and arran ement can be made toy suit different conditions of use and that, except as pointed out in the accompanying claims, the` invention is not restricted to the precise construction shown and described herein.

I claim as m invention.: i

1. The combination with a rotary kiln for the manufacture of cement, of a circumferentialseries of individual cooling drums positioned at the discharge end of the kiln and adapted to receive the clinker formed by the passage of the materials Y the movement ofthe clinker therein toward the rear or delivery ends, anda second circumferential series of cooling drums also 'supported by the kiln but exteriorly to the first series of drums and arranged to receive at their rear ends the partially cooled clinker from the drums of the first series and to discharge the cooled clinker at their forward ends.

3. The combination with a rotary kiln for the manufacture of cement, of a circumferential series of individual cooling drums positioned at the dischargel end of the kiln and adapted to receive the clinker formed by the passage of the materials through the successive Zones of the kiln, said drums being supported about the kiln, connections through which the clinker is discharged from the kiln to the ends of said drums, means to support the drums at one end from the kiln, a flexible plate secured to the kiln at the other ends of the drums, and means whereby the drums are supported by said plate at such other ends to permit longitudinal expansion and contraction of the drums.

- 4.' The combination with a rotary kiln for the manufacture of cement, of a circumferential series of individual cooling drums positioned at the discharge end of the kiln and adapted to receive the clinker formed by the passage of the materials through the successive zones of the kiln, said drums being supported about the kiln, connections through which the clinker is discharged from the kiln to the ends of said drums, a second circumferential series of cooling drums about the kiln externally to the first series of drums and arranged to receive at one end the par- `tially cooled clinker from-the drums of the first series and to discharge the cooled clinkei` at the other end, a plate secured to the kiln to support the drums of both series at one end, av flexible plate to support the drums of the second series at the other end, and connections whereby the di'ums of the first series are supported at one end'vup'on the drums of the second series.

k5. In a rotary kiln for the manufacture of cement having a shell and a lining of .refractory material, openings for the discharge of clinker, a kiln extension between.

the openings and the burning zone, and' a thickened portion in the lining interiorly and cireumferentially at the delivery end of the burning Zone to form an interior circumferential shoulder to rctardthe movement of the clinker from the burning zone info the kiln extension beyond the burning zone. 6. The combination with a rotary kiln for the manufacture of cement, of a cireumferf ential series of individual cooling drums positioned at the discharge end of the kilnand adapted to receive the clinker formed by the passage of the materials through the successive zones of the kiln, said drums being supported to receive at one end the clinker from the kiln and to discharge the cooled clinker and receive cooling air at the other end, and a hood about the upper part of the kiln and its associated drums and open at the bottom, and a stack to which the hoo-d is connected atthe top. v7. The combination with a rotary kiln for the manufacture of cement, of a circumferential series of individual cooling drums positioned at the discharge end of the kiln and adapted to receive the clinker formed by the passage of the materials through the successive zones of the kiln, said drums being supported about the kiln, connections through which the clinker is discharged from the kiln to the ends of said drums, a second circumferential series of cooling drums about the kiln externally to the first series of drums and arranged to receive tlie clinker at one end from the drums of the first series and to discharge the clinker at the other end, a hood about the kiln andr its associated drums and open at the bottom, and a stack to which the hood is connected at the top. 8. In a rotary kiln for the manufacture of cement having a shell and a refractory lining with openings through the shell and the lining for the discharge of the clinker, bushings extended inwardly through said openings, and a sectional ring applied ex-v ternally tothe shell to retainvsaid bushings in position. Y

9. In a rotary kiln for the manufacture of cement having a shell and a refractory lining with openings through the shell andthe lining for the discharge of the clinker, bushings extended inwardly through said openings, a sectional ring applied externally to the shell to retain said bushings in position a circumferential series of cooling drums supported by the kiln about itself, and elbow connections connecting each' bushing with the corresponding drum.

10. Thecombination withha rotary kiln lfor the manufacture of cement having in its4 peripheral wall openings for the discharge -of the clinker 'and an open discharge end with a cylindrical iange, a sealing ring mounted on said flange, and a two-part door carrying atwo-partggrooved ring for engaging the sealing ring to seal the discharge en e lio 11. rlhe combination with a rotary kiln for the manufacture of cement, -of a longitudinally movable fuel tube, alongitu-dinally disposed beam supported in front of the kiln, a trolley on said beam, means by Which the movable fuel tube is supported from the trolley, and a relatively fixed fuel tube having a telescope connection with the movable fuel tube.

12. rlhe combination with a rotary kiln for the manufacture of cement, of a circumferential series of individual cooling drums positioned at the discharge end of the kiln and adapted to receive the clinker formed by the passage of thematerials through the successive Zones of the kiln, said drums vbeing supported about the kiln, connections through which the clinker is discharged from thekiln to said drums at one end, a second circumferential series of cooling drums aboutJ the kiln `externally to the rst series of drums, connections from the drums of the first series to the drums of the second series, and spouts in the drums of the second series to conduct the clinker from they drums of the first series to the drums of the second series and to prevent the return of material from the drums of the second series to the drums of the firstseries.

13. The combination with a rota kiln for the manufacture of cement, of a circum-I ferential series Aof individual cooling drums positioned at the discharge end of the kiln and adapted to receive the clinker formed by the passage of the materials through the successive zones of the kiln, said drums being supported to receive at one end the clinker from the kiln and to discharge the cooled clinker and receive cooling air at the other end, a hood about the upper part of the kiln and its associated drums and open at the bottom, and means to draw hot air from the hood and deliver it with the fuel into the kiln.

This specification signed this 12th day of NOV. A. D. 1925.

POV'L T. LINDHARD.

seu 

